assert_equal 3, nodes.count
assert_equal 4, nodes[0].node_id
assert_equal 15, nodes[1].node_id
assert_equal 3, nodes.count
assert_equal 4, nodes[0].node_id
assert_equal 15, nodes[1].node_id
assert_equal 3, nodes.count
assert_equal 4, nodes[0].id
assert_equal 15, nodes[1].id
assert_equal 3, nodes.count
assert_equal 4, nodes[0].id
assert_equal 15, nodes[1].id
assert_equal 3, nodes.count
assert_equal 4, nodes[0]
assert_equal 15, nodes[1]
assert_equal 3, nodes.count
assert_equal 4, nodes[0]
assert_equal 15, nodes[1]